Brake drum machine



Nov. 29, 1938. I c. w, DAKE BRAKE DRUM MACHINE Filed Aug. 17, 1956 2sheets-sham. 1

Nov. 29, 1938. c. w. BAKE 2,138,288

BRAKE DRUM MACHINE Filed Aug. 1'7, 1936 2 SheetsSheet 2 UNITED STATESPATENT OFFICE 2,138,268 BRAKE DRUM MACHINE Charles W. Dake, Grand Haven,

Wyant & Cannon to Campbell,

Mich., assignor Foundry Company, Muskegon, Mich., a corporation ofMichi- Application August 17,

8 Claims.

This invention relates to mechanism or apparatus used in the manufactureof brake drum shells and particularly those shells which, after they areformed,

may be lined with a braking lining of a difierent material than theshell.

Brake drums of a made.

I have heretofore m method of producing sai in an application, Seria l6,1936. The method of ade application for the d steel brake drum shells 1No. 69,020, filed March said pending application. The presentapplication may be considered a continuation in part tion.

lined with a cast iron liner, drums may be produced,

of such prior applicatwo finished brake though it will be evident that ashell for one completed brake drum only might be made without departingfrom my invention.

An understanding of theform of apparatus embodying the same, may be hadfrom the following description taken in connection with the accompanyingdrawings, in

which:

apparatus.

Fig. 3 is a. similar pletion of the brake Fig. 4 is a plan view sectionshowing the comdrum shell forming, and

of the die into which the metal is pressed to form the shell.

Like reference characters refer to in the difierent figures The diewhich is used like parts of the drawings. I includes a die supportinvention, and one- 1936, Serial No. 96,417 (Cl. 113-43) tions 2, threeof the sections being shown and inserted into the support I, therebyproviding a die having a substantially cylindrical interior recess atthe bottom of which is a pilot opening 3. Around the pilot opening is anannular depression 4 and in the vertical walls of the cylindricalrecess, spaced apart continuous grooves 5 are provided as shown. Theupper sides of the die sections 2 at their tions have horizontal ledges6 in the same plane with the upper side of the die support I. Within thehorizontal ledges 6 are upwardly extending ribs 1, the three ribs 1 ofthe three die sections make a continuous upwardly extending rib entirelyaround the vertical cylindrical recess in the assembled die.

On a support 8 a hydraulic cylinder apparatus is positioned. It includesan upper cylindrical section 9, at the lower end of which is a somewhatlarger and shorter cylindrical section In, and below which is a stilllarger cylindrical section II. The inner wall of the section III is machined out at its lower portion providing an annular shoulder l2.Likewise the inner wall of the section II is provided with a similarshoulder' l3 while the upper cylinder 9 has a continuous shoulder M atits upper end. Above the shoulder I4 is a relatively short cylindricalrecess l5 .to which'an inlet pipe l6 leads having a control valve I! inits length. Similarly, above the shoulder I2 is a cylindrical recess illwith a pipe l9 leading thereto and a control valve 20 in said pipe.Above the shoulder I3 is a cylindrical recess 2|, a'pipe 22 with acontrol valve 23 therein leading thereinto as shown.

Within the lower section II a die punch 24 is mounted having acylindrical outer surface received within the section II and having acentral cylindrical opening therethrough. Around the lower end of thecentral opening the metal is cut away to provide a surrounding annularrecess 25 at the upper part of which, and around the central openingthrough the punch 24, is a continuous annular recess 21, the walls ofwhich are of upwardly and inwardly concave form as shown. By cutting theannular recess 25 there is left a downwardly projecting rib having ahorizontal underside 26 which, when the punch 24 is moved downwardly,seats upon the ledge 6 of the assembled die, with the rib I receivedwithin the recess 25. v i

A second die punch 28 in the form of a sleeve has its upper end portionreceived within the section In below the annular shoulder and extendsdownwardly through the central opening outer peripheral porof the outerpunch 24. Within the sleeve 28 is a central punch 29 of substantiallysolid construction; At its lower end it is equipped with a downwardlyextending pilot 30 of a diameter such as to be received within theopening 3 of the assembled die and with an annular surrounding taperedsection 3| complementary to the annular recess'4 around the opening 3 inthe die. All of the cylindrical positions or sleeves 29, 28 and 24 maybe equipped with suitable sealing rings so as to retain oil which ispumped under pressure into the recesses l5, l8 and 2| above the severalpunches.

The inner punch 29 has an opening 32 from its upper end downwardlytherethrough to within a short distance of its lower end and withhorizontal branches 33 extending radially outward from the lower end ofthe opening 32 to the walls of the punch. A pipe 34 is connected withthe upper end of the punch 29 in conjunction with the opening 32 andpasses through a suitable stuffing box packing construction 35 at theclosed upper end of the upper cylindrical section 9. A control valve 36is located in the length of the pipe 34.. It is to be understood that asthe punch 29 is moved described, the pipe 34 moves with the punchthrough the packing at 35 and that the valve 36 is located sufiicientlyhigh that it will not come to the stuffing box when the punch is in itslowermost position.

' In the operation of the apparatus, a hat cir cular plate 31 ofsuitable material such as a low carbon steel is laid over the annularrib I. The plate has a central opening to receive the lower reduced end30 of the punch 29 as shown in Fig. 1 to thereby properly locate theplate. The first operation is to open the valve at whereupon oil orother liquid under pressure is forced into the upper section 9 above thepunch 29, moving the,same downwardly until the pilot end 30 enters Qtheopening 3 in the die assembly. When this seems the central portion ofthe plate 31 is shapedqinto a web or back 38 (Figs. 2

and 3) while the outer portions of the plate provide an upwardly andoutwardly inclined continuous wall 39, the upper edges of which extendabove the ribs 1.

The next operation is to open the valve at 23 whereupon the outer punch24 is moved downwardly, the ribs 1 of the die assembly entering theannular recess 25 and the lower side 26 of the punch seating on theledge 6 to make a tight sealing contact. At ,the same time the upperedge portions of the annular side walls 39 are moved inwardly by theirengagement with the concaved walls of the annular recess .21, therebyturning the metal inwardly .to the position indicated in dotted lines at40 inEFig. 2.

The next operationis to open the valve 20 whereupon the intermediatesleeve punch 28 moves down to the position shown in- Fig. 3., Thisengages the incurved annular portions indicated at 40 and bends the sameinwardly to make a continuous inwardly extending annular flange 4|.

After these operations have been performed the'valve at 36 is opened andoil under very heavy pressure passed through the passages 32 and 33draws to press the metal against the walls of the die and into thegrooves 5 thereof as shown in Fig. 3. The inclined wall 39 thereuponbecomes substantiallyvertical as at 39a in Fig. 3 with continuousannular ribs grooves 5. This completes the shaping of the downwardly, aswill be later 42 pressed into the plate 31 into the form desired andprovides a drum shell which, in accordance with previous practice, maybe heated to a high degree of temperature, rotated in a suitable fixtureand have molten iron at a very high degree of temperature deposited inthe continuous annular trough between the after which the compositestructure produced may be divided between the ribs 5 and a suitable backwelded or otherwise secured to the flange fiange 4| and the back 38,

ceeding operation. The die assembly with the I shell therein may then beremoved from the supporting block I and the sections of the diedisassembled from the drum shell to release the formed shell.

The apparatus described is an efiective apparatus for readily, producingsheet metal drum shells in accordance with the method disclosed in myearlier application. While a hydraulic operation of the punches has beenshown and described, the invention is not to be limited thereto as thereare many other ways in which the movements of the punches may beattained.

The invention is defined in the appended claims and is to be consideredcomprehensive of all forms of structure coming within their scope.

I claim:

1. In an apparatus of the class described, a die having a substantiallycylindrical recess therein over which a fiat plate of metal of greaterdiameter than the diameter of the recess is to be placed, a punch, meansfor operating the punch to press the plate of metal into the die, withthe outer portions of the metal extending upwardly, in more or lessspaced relation tothe sides of the recess, and having edge portionsextending above the upper side of the die, a second punch outside of thefirst punch, means for operating the same to engage against the upperedge portions of said metal and curve the same inwardly, a third punchlocated between the first and second punches, means for operating thesame to engage said incurved edges of the metal to bend.the same into aflange, and means for exerting pressure against the metal thus formed toconform it to said die recess, substantially as described.

2. An apparatus for forming from plates of fiat metal comprising, a diehaving a recess of a desired shape over which a plate of flat metal isadapted to be located, a punch for forcing the metal into the die sothat a portion of the plate will be spaced from the sides of saidrecess, a second punch located around the first punch for seatingagainst the upper end of the die and-sealing the same, a third punchsurrounding the first punch and between the same and brake drum shells3. In a construction of the class described, a

through said punch for conducting liquid under 4 4. Apparatus of theclass described comprising.

a die having a recess therein over which die and recess a fiat plate ofmetal is adapted to be placed, a punch ereagainst, exerting pressureupon the metal to conform the same to the walls of said die recess. 5.In an apparatus for forming brake drum shells comprising among itselements a die having a recess therein conforming to the outeriperipheryand supporting back of a brake drum shell over which a metal blank fromwhich to form the said brake drum shell is placed, a punch for forcing aportion of said blank into the recess of the die, a second punchengaging the edge of said punch for forming the shell to conform withthe g5 interior of the die.

6. In an apparatus for forming. brake drum shells comprising among itselements a die having a recess therein conforming to the outerperiphery, a brake drum shell over which a metal blank from which toform the said brake drum shell is placed, a punch for forcing a portionof said blank into the recess of said die, a second punch engagedge ofsaid blank periphery of the first named punch for forming the shell toconform with the interior of the die.

7. In an apparatus for forming brake drum shells, the said apparatusincluding a die having an annular recess therein and an annular wallconforming to the outer periphery of the brake flange at one side ofsaid shell and means for producing fluid pressure within the said dieand around the first named punch for expanding the said partly formedshell within the die.

CHARLES W. DAKE.

